src/test/run-fail/panic-parens.rs

// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

// Fail macros without arguments need to be disambiguated in
// certain positions
// error-pattern:oops

fn bigpanic() {
    while (panic!("oops")) { if (panic!()) {
        match (panic!()) { () => {
        }
                     }
    }};
}

fn main() { bigpanic(); }